"Janzenella, new genus, is described from the Neotropics (type species: J. innupta, new species). The position of the genus within the superfamily is unclear. Janzenella is characterized by the strongly depressed body, ...

"The strangest features in the arrangement of the head muscles in Protoceratops consist in the orbital location of the pseudotemporalis as in the Psittaci and in the slight muscular covering of the lateral surface of the ...

"We describe upper and lower jaws of Placenticeras Meek, 1876, from the Upper Cretaceous (Upper Campanian) Bearpaw Shale and Pierre Shale of the Western Interior of North America and lower jaws of the related ammonite ...

"Jimomys labaughi is a new genus and species of rodent of early Barstovian age. Morphology of the lower jaw, dentition, and incisor enamel indicates that the form is a geomyid. The crown pattern of the cheek teeth appears ...

"The first Mesozoic actinopterygian fishes from Antarctica were discovered in lacustrine interbeds within the Lower Jurassic Kirkpatrick Basalt, in the Transantarctic Mountains, Victoria Land. Except for an enigmatic patch ...

"Seven genera of fishes from the Jurassic (Upper Bathonian-Callovian) Sundance and Wanakah formations of western United States are described and their relationships discussed together with a review of their stratigraphic ...

"There are two valid turtle taxa from the North American late Jurassic Morrison Formation: Glyptops plicatulus, distinguished by a fine, pustulose shell ornamentation, last vertebral scute partially dividing the last pair ...

"Mesozoic remains of embryonic and early juvenile birds are rare. To date, a handful of in ovo embryos and early juveniles of enantiornithines from the early Cretaceous of China and Spain and the late Cretaceous of Mongolia ...

"A marine reptile from the Ladinian deposits near Xingyi is described and identified as a juvenile of Anshunsaurus wushaensis on the basis of similar skull proportions and many postcranial characters. Based on this specimen ...

"Two males typical of Cnemidophorus lacertoides from Abra de Perdomo, Uruguay, had a diploid number of 50 chromosomes, including 26 macrochromosomes (all telocentric or essentially so, excepting one pair of submetacentrics) ...

"Karyotypes of all the species in the spinosus group of lizards of the genus Sceloporus were analyzed by means of the colchicine, hypotonic citrate, air-dried technique, employing both bone marrow and testicular tissues. ...

"Karyotypes of 11 species of Sceloporus are described and illustrated. Lizards included are all species of the variabilis group as recognized by Smith (1939), all species of the jalapae and scalaris groups as recognized ...

Karyotypes are described for six species of snakes from the Western Hemisphere, and comparisons are made with all species of snakes from around the world that have been karyotyped with modern methods. Although there is ...